JAVA基础学习之路（三）类定义及构造方法

class Book {//定义一个类
    int price;//定义一个属性
    int num;
    public static int  getMonney(int price, int num) {//定义一个方法
        return price*num;
    }
}

public class test2 {
    public static void main(String args[]) {
        Book monney = new Book();//声明并实例化对象
        monney.price = 10;
        monney.num = 20;
        System.out.println(monney.getMonney(10,20));
    }
}

class Book {
    private int price;
    private int num;
    public void setPrice(int p) {
        price = p;
    }
    public void setNum(int n) {
        num = n;
    }
    public int getPrice() {
        return price;
    }
    public int getNum() {
        return num;
    }
    public  int  getMonney(int price, int num) {
        return price*num;
    }
}

public class test2 {
    public static void main(String args[]) {
        Book monney = new Book();
        monney.setPrice(10);
        monney.setNum(20);
        System.out.println(monney.getMonney(10,20));    
    }
}